Update README.md

Author: mrinal1704

README.md

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 # SQL-Leetcode-Challenge 
 
 ## Motivation
-This repo contains all my SQL solutions from Leetcode website in order to practice my SQL programming skills. I attempted all questions in 30 days to corroborate my knowledge in SQL.
+This repo contains all my SQL solutions from Leetcode website in order to practice my SQL programming skills. I attempted all questions in 25 days to corroborate my knowledge in SQL.
 
 ## Description
 The solutions are divided into three level of categories namely Easy, Medium, and Hard. Every category first contains the question and then followed by its respective solution.